[MITgcm-support] Awkward parameters in tutorial_reentrant_channel

[David Ferreira]

Hi all,

OK, I see the rational although it does hurt my “Taylor expansion feelings”. It’s not mathematically consistent.
Might be worth a comment in the doc why it is done like that?
Cheers,
David



From: MITgcm-support <mitgcm-support-bounces at mitgcm.org> on behalf of Edward Doddridge <edward.doddridge at utas.edu.au>
Reply-To: "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org>
Date: Friday, June 18, 2021 at 6:03 AM
To: "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org>
Subject: Re: [MITgcm-support] Awkward parameters in tutorial_reentrant_channel

Hi all,

Mike is correct - f0 was chosen for the southern boundary and beta is chosen for the midpoint of the domain. This means the beta-plane approximation is centred in the domain, which makes most sense to me.

Cheers,
Ed


________________________________
Edward Doddridge (he/him)
Research Associate and Theme Leader
Australian Antarctic Program Partnership (AAPP)
Institute for Marine and Antarctic Studies (IMAS)
University of Tasmania (UTAS)


www.doddridge.me<http://www.doddridge.me>


On 18 Jun 2021, at 05:11, MICHAEL A SPALL <mspall at whoi.edu<mailto:mspall at whoi.edu>> wrote:

Is it because f0 applies to the southern limit of the domain (f=f0+beta*(y-y0), where y0 is at j=1) and beta was chosen to be representative of the mid-latitude of the domain?

Mike

On 6/17/21 3:08 PM, Jeffery R Scott wrote:
Hi David,

Thanks for alerting this to us. These numbers came from Ed Doddridge's SO setup, and values probably overlooked as the tutorial lat-lon domain evolved to final form...
but not sure why they were originally chosen as such. Perhaps Ed can recall?

Jeff


________________________________
From: MITgcm-support <mitgcm-support-bounces at mitgcm.org><mailto:mitgcm-support-bounces at mitgcm.org> on behalf of David Ferreira <dfer at mit.edu><mailto:dfer at mit.edu>
Sent: Thursday, June 17, 2021 2:33 PM
To: mitgcm-support at mitgcm.org<mailto:mitgcm-support at mitgcm.org>
Subject: [MITgcm-support] Awkward parameters in tutorial_reentrant_channel

Hi all,


Having a look at the zonally reentrant channel in verification, in data we have:


# Coriolis parameter
 f0=-1.363e-4,
 beta=1.313e-11,


fo corresponds to a latitude of 70S, while beta corresponds to 55S.


No big deal, but curious if this intentional and if so why. Artificially reinforcing beta effect?


Cheers,
David





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